The giant squid Architeuthis dux is a species of deep-ocean dwelling squid in the family Architeuthidae. It can grow to a tremendous size, offering an example of deep-sea gigantism : recent estimates put the maximum size at around 12—13 m 39—43 ft     for females and 10 m 33 ft  for males, from the posterior fins to the tip of the two long tentacles longer than the colossal squid at an estimated 9—10 m 30—33 ft ,  but substantially lighter . The mantle of the giant squid is about 2 m 6 ft 7 in long more for females, less for males , and the length of the squid excluding its tentacles but including head and arms rarely exceeds 5 m 16 ft. The number of different giant squid species has been debated, but recent genetic research suggests that only one species exists.
Sperm Whales and Giant Squid: Just-So Story and Co-Evolution | Carnegie Museum of Natural History
Sperm whales dive to great depths to more than 2 km or 1. But how did the first sperm whale know it would find giant squids in the ocean depths? The following story is speculation that makes sense but has no facts to support it. Scientists often refer to such stories as just-so stories, named after the stories by author Rudyard Kipling. Before whales evolved, it could be that giant squids lived near the ocean surface. After whales evolved and discovered that squids are tasty, the giant squids might have started living in deeper water, to escape the whale predators. Some whales might have started diving more deeply and developed specialized physiology allowing them to hold their breath up to 90 minutes and to resist the great pressure at depth so they could feast on the squid, so the squid might have responded by living deeper still.
Sperm Whales and Giant Squid: Just-So Story and Co-Evolution
What sorts of crazy thoughts would be going through your head if you had the unique opportunity to witness something as large as a school bus 37 ft fighting with something as large as an wheeler semi truck ft? Think about it next time you are out on the road… Because, believe it or not, beneath the surface of the ocean battles of such epic proportions are common occurrences. These animals are enormous: Giant Squid reach estimated maximum lengths of 33 feet for males and 43 feet for females; Colossal Squid are estimated to reach maximum lengths of feet and weigh more that the Giant Squid; and an adult Sperm Whale which is the largest toothed animal is over 60 feet claims of up to 67 feet. It may seem strange that there are not exact numbers for the lengths of these animals… take into account, though, that these creatures spend the majority of their time at or below depths of at least 3, feet.
The world's biggest squid species have developed huge eyes to give early warning of approaching sperm whales. Colossal and giant squid both have eyes that can measure 27cm 11in across - much bigger than any fish. Scientists found that huge eyes offer no advantages in the murky ocean depths other than making it easier to spot enormous shapes - such as sperm whales. Writing in Current Biology journal , they say this could explain the equally huge eyes of fossil ichthyosaurs.